Alarm.



No. 888,025. PATENTED MAR. 24, 1908. H. IRWIN.

ALARM.

APPLICATION FILED MAY 1, 1907.

ATTORNEYS 7n: NORRIS PITIIS co., wasnmcran. o. c.

Ma V

UNITED STATES PATENT OFFICE.

HAROLD IRWIN, OF TIKOKINO, NEW ZEALAND.

ALARM.

To all whom it may concern:

Be it known that I, HAROLD IRWIN, a subject of the King of Great Britain, and a resident of Tikokino, New Zealand, have invented a new and Im roved Alarm, of which the following isa fu clear, and exact description.

The invention relates to alarms for scaring birds and for other purposes, and its object is to provide a new and improved alarm, which is simple and durable in construction, cheap to manufacture, and arranged to sound alarms by periodic explosions of fire crackers and like detonating devices.

The invention consists of novel features and parts and combinations of the same, which will be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accom anying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of the improvement; Fi 2 is a sectional plan view of the same on t e line 22 of'Fig. 1, and Fig. 3 is a sectional side elevation of the same.

The improved alarm is mounted in a suitably constructed casing A, provided with a removable cover B and with a hopper-shaped bottom. C dischargin into an explosion receptacle D, preferably of 0 en wire mesh, and removably attached at its upper end to hooks E arranged on the outside of the casing A at the base thereof, as plainly indicated in the drawings. Within the casm A is secured a spider or other frame worr F supporting a spirally arranged support G, carrying at intervals U shaped hooks or forks E, into which is placed a slow burning fuse I of any approved construction. On the hooks II are tied or otherwise secured the fuses J y of fire crackers or like detonating devices J, which are thus suspended within the casing A with their fuses J in contact with the slow burning main fuse I. By arranging the slow burning fuse in the manner described a large number ofindependently supportedfire crackers or like detonating devices J may be used in one ap aratus. Now it is evident that when the s ow burning fuse I is ignited at one end it finally reaches the fuse J of the first fire cracker J, and consequently this fire cracker fuse is ignited and burns, and in so doing becomes detached from the hooks H and drops down into the hopper O, and from Specification of Letters Patent.

Application filed May 1, 1907.

Patented March 24, 1908.

Serial No. 371,224.

the latter down into the bag D, in which the fire cracker finally ex lodes through the medium of its burning se. The slow burning main fuse I finally reaches the fuse of the next fire cracker, and so on, until all the fire crackers are detached and their fuses ignited, as above explained, the detached fire crackers with their ignited fuses dropping down into the receptacle D to be exploded therein. Now as the main fuse I burns very slowly, it is evident that the fire crackers or detonating devices J are exploded in the rece tacle D at stated intervals, and consequent y the apparatus forms a .very serviceable alarm for scaring birds from fields. It will also be seen that the device may be used in places in which like periodic alarms are desired.

The casing A is provided at one side with a bracket K for convenientl attaching it to a post or other support, wit a view to hold the apparatus a desired distance above the ground.

As the explosion receptacle D is of an open mesh or perforate material it allows free escape of the smoke and fumes arising from the exploding detonating devices, and at the same time the receptacle prevents any portions of the exploded fire crackers or detonating devices from scattering over the surroundings, thus preventing flying fragments from setting fire to the surroundings.

By having the hopper-shaped bottom C any ignited portions of the exploded fire crackers are prevented from passing upwards into the casing and prematurely igniting the crackers suspended therein.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. An alarm comprising a casing provided with a removable cover, and a hoppershaped bottom, a perforate explosion chamber detachably connected with the casing and into which the hopper discharges, a spider within the casing provided with a plurality of U -shaped hooks, a main fuse supported by the hooks, and a plurality of detonating devices having their fuses connected with the hooks and contacting with the main fuse.

2. An alarm comprising a slow burning fuse, means for supporting the same, suspended detonating devices having fuses, each of the latter being in contact with the said slow burning fuse, the latter on burning successively igniting the fuses of the said porting a main slow burning fuse, and detonating devices having fuses each secured to one of the said hooks and in contact with the said main fuse.

In testimony whereof I have signed my name to this specification inthe presence of tWo subscribing Witnesses this 26th March 1907.

HAROLD IRWIN.

Witnesses:

J G. DUNoAN, S. PHILIPSON. 

